A new card may be insufficient. Yardstick for HD is 1gb for every 4 minutes of video with a better option having two HDs with one just for editing and the other taking all the otherstuff such as your ops.sys. and application(s).
Win 98SE is, I believe, minimum ops. system.
128mb RAM minimum.
I'm also not sure about a 200mhz processor. It might be borderline.
I use ATI A-I-W card which handles analogue into digital.
Hoe this helps.